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Inverter-integrated rotating electric machine having improved thermal characteristics

a technology of integrated rotating electric machines and electric motors, which is applied in the direction of magnetic circuit rotating parts, magnetic circuit shapes/forms/construction, windings, etc., can solve the problems of increasing the size of the case, complex wiring and connection, and affecting the operation of the control circuit, etc., to achieve excellent thermal characteristics and minimize heat transfer

Active Publication Date: 2011-03-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The inverter-integrated rotating electric machine thus structured can minimize heat transfer from the power circuit portion to the control circuit portion, thereby offering excellent thermal characteristics.

Problems solved by technology

This conventional structure has a problem that the control circuit tends to be damaged by heat buildup.
If the control circuit is isolated from the power circuit by providing a partition for preventing heat transfer within the case, there arises another problem that the provision of the partition results in an increase in the size of the case.
A further problem of the conventional structure is that complex wirings and connections are needed to be made, because the power circuit and the control circuit are arranged on a common plane in the case.

Method used

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  • Inverter-integrated rotating electric machine having improved thermal characteristics
  • Inverter-integrated rotating electric machine having improved thermal characteristics
  • Inverter-integrated rotating electric machine having improved thermal characteristics

Examples

Experimental program
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first embodiment

[0016]FIG. 1 is a cross-sectional view showing the structure of an inverter-integrated rotating electric machine according to a first embodiment of the invention. Referring to FIG. 1, the inverter-integrated rotating electric machine has an enclosure 100 made up of a motor housing 3 and an outer case 9, the enclosure 100 accommodating an AC motor 4 which includes a stator 40 having stator coils 41 housed in the motor housing 3, a rotor 11 fixedly mounted on a rotary shaft 1 and a fan 2 whose rotation introduces external air into the enclosure 100 from outside, the fan 2 being fixed to the rotor 11, as well as an inverter unit 50 for converting input direct current (DC) power into AC power. The inverter unit 50 is disposed in a vent hole 90 formed in the enclosure 100 through which the external air is introduced from outside into the enclosure 100 along directions shown by arrows A as the fan 2 rotates. The inverter unit 50 includes a power circuit portion 60 and a control circuit po...

second embodiment

[0019]FIG. 2 is a cross-sectional view showing the structure of a principal part of an inverter-integrated rotating electric machine according to a second embodiment of the invention, in which elements identical or similar to those of the first embodiment are designated by the same reference numerals.

[0020]The inverter-integrated rotating electric machine of the second embodiment is obtained by modifying part of the inverter-integrated rotating electric machine of the first embodiment. Shown in FIG. 2 is an enlarged view of the modified part. What is characteristic of this embodiment is that resin-molded signal lines 801 from the power circuit portion 60 are routed through a specified single location, that is, a central portion of the inside wall of the case 71 facing the power circuit portion 60 in an illustrated example of FIG. 2, where the “specified single location” refers to any location convenient for determining circuit layout of the control board 72. This arrangement helps p...

third embodiment

[0022]FIG. 3 is a cross-sectional view showing the structure of a principal part of an inverter-integrated rotating electric machine according to a third embodiment of the invention, in which elements identical or similar to those of the foregoing embodiments are designated by the same reference numerals.

[0023]The inverter-integrated rotating electric machine of the third embodiment is obtained by modifying part of the inverter-integrated rotating electric machine of the first embodiment. Shown in FIG. 3 is an enlarged view of the modified part. What is characteristic of this embodiment is that the control circuit portion 70 includes in the case 71 thereof wiring conductors 74 made of electrically conductive elements which are connected to the signal lines from the control board 72 at specified points and molded in the case 71. The resin-molded signal lines 80 from the power circuit portion 60 are passed through the holes 81 and connected to the wiring conductors 74, whereby the sig...

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PUM

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Abstract

An inverter-integrated rotating electric machine includes an enclosure in which a vent hole is formed, an AC motor accommodated in the enclosure, the AC motor including a rotor and a fan whose rotation introduces external air into the enclosure from outside through the vent hole, the fan being fixed to the rotor, and an inverter unit accommodated in the enclosure and disposed in the vent hole. The inverter unit includes a power circuit portion and a control circuit portion whose control board is housed in a case which thermally isolates the control board from the power circuit portion. The power circuit portion is located at a position facing the fan and the control circuit portion is located upstream of the power circuit portion with respect to an inflow of the external air. Signal lines from the power circuit portion are connected to signal lines from the control circuit portion through holes formed in the case.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to a rotating electric machine with a built-in inverter (inverter-integrated rotating electric machine), and more particularly, to an inverter-integrated rotating electric machine having improved thermal characteristics.[0003]2. Description of the Background Art[0004]Inverter-integrated rotating electric machines are conventionally known. For example, Japanese Patent Application Publication No. 2004-274992 discloses an inverter-integrated rotating electric machine, in which switching devices, a control circuit and a large number of wirings carrying small currents, for instance, are accommodated in a case to provide mechanical and electrical safety.[0005]A conventional inverter-integrated rotating electric machine is typically structured in such a way that a control circuit and a power circuit including switching devices are arranged in close proximity to each other in a case, so t...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H02K9/00H02K5/00H02K5/22H02K9/02H02K9/04H02K5/20
CPCH02K9/06H02K11/0068H02K11/0073H02K11/30H02K11/33
Inventor KATO, MASAKIAKITA, HIROYUKIASAO, YOSHIHITO
Owner MITSUBISHI ELECTRIC CORP